Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
ban thoi » ban thi, ban thai, ban toi
thoi dap » hoi dap, thoi dai, thi dap
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
hang tai » hang va, dung tai
thu ban » thu hang
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ban thoi dap, nghien cuu khoa hoc doanh khoa hoc xa hai van ((phan dau) or (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ban thoi dap, nghien cuu khoa hoc doanh khoa hoc xa hai van ((phan dau) OR (hang tai)).
• Adding a wildcard symbol may retrieve word variants: thu ban thoi dap, nghien cuu khoa hoc doanh khoa hoc xa hai van ((phan dau) or (hang tai))*.